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Example a. Action() operating with the Composite development The composite trend is a partitioning layout trend. The composite trend describes a bunch of gadgets which are to be handled within the comparable method as a unmarried example of that item. the common software is a tree constitution illustration. instance 3-25 demonstrates a tree constitution. The pattern focuses extra on the best way to entry this tree constitution and convey again the end result. The dynamically generated wrapper item might be taken care of like a customer to the tree. The customer accesses the node and brings the outcome again to the invoker. within the pattern code, the CompositeNode constitution not just defines the tree but additionally defines 3 universal how one can traverse the tree. It does the heavy lifting via encapsulating the tree traversal set of rules. The customer defines find out how to approach the one node and is answerable for bringing the end result again to the invoker. during this pattern, the customer provides the price within the tree nodes and brings again the sum. instance 3-25. An instance of the composite development // outline customer interface sort IVisitor = summary member Do : 'T -> unit // outline a composite node style CompositeNode = | Node of 'T | Tree of 'T * CompositeNode * CompositeNode with // outline in-order traverse member this. InOrder f = fit this with | Tree(n, left, correct) -> left. InOrder f f n correct. InOrder(f) | Node(n) -> f n // outline pre-order traverse member this. PreOrder f = fit this with | Tree(n, left, correct) -> f n left. PreOrder f correct. PreOrder f | Node(n) -> f n // outline publish order traverse member this. PostOrder f = fit this with | Tree(n, left, correct) -> left. PostOrder f correct. PostOrder f f n | Node(n) -> f n allow invoke() = // outline a tree constitution permit tree = Tree(1, Tree(11, Node(12), Node(13)), Node(2)) // outline a customer, it will get the precis of the node values permit wrapper = allow consequence = ref zero ({ new IVisitor with member this. Do n = end result := ! outcome + n }, end result) // pre-order iterates the tree and prints out the outcome tree. PreOrder (fst wrapper). Do printfn "result = %d" ! (snd wrapper) Execution outcome from the composite development pattern bought through calling the invoke functionality outcome = 39 operating with the Template development The template trend is, as its identify indicates, a application or set of rules skeleton. it's a behavior-based development. In F#, we've got higher-order capabilities that may function a template to generate different features. it really is traditional to exploit higher-order capabilities to enforce this development. instance 3-26 defines a three-stage database operation functionality named TemplateF. the particular implementation is equipped open air of this skeleton functionality. i don't imagine the database connection and question are the entire comparable, so 3 services are left open air of the category definition, and the person can outline and cross of their personal model of every. instance 3-26. An instance of the template development // the template development takes 3 capabilities and kinds a skeleton functionality named TemplateF style Template(connF, queryF, disconnF) = member this.